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The Big 6 Patterns

 
NDP Prasad
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why there is only 6 patterns are included in the Exam? If after finishing SCWCD, if my interviewer asked me about a situation and design a pattern, i need to know other patterns also...

why DAO and value object are not in the big 6?

Is those thing not important?





 
NDP Prasad
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Can anyone working in the J2ee project please clarify this...
 
NDP Prasad
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please also tell me what are other patterns important
 
Marc Peabody
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DAO used to be on the SCWCD but it was removed because it's actually in the business tier.

Value Object was changed to Transfer Object for the exam because, well, what the exam described was really a Transfer Object and not a Value Object. The two terms get used interchangeably a lot. But a Value Object really only holds (by Martin Fowler's description in the book UML Distilled) one value. A Date object would be a Value Object; it has one value. A Transfer Object, on the other hand, is meant to hold multiple objects/values to pass them all together in a method's return type so you don't have to call a separate method for every value you need returned.

In the ScwcdLinks link in my signature, you'll find PeabodyOnScwcdPatterns under Rancher Notes. That should give you good direction for both the Big 6 and where to go next for learning more.
 
NDP Prasad
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Thanks Marc.
 
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